Optimization of process variables on Methylene Blue removal by low cost biosorbent using Central Composite design

Industrial activities generate large volume of wastewater containing hazardous inorganic (metals) or organic (microbes, dyes/pigments) species. Dye contaminated wastewater is one of the visual significant pollution generated from plastic, cosmetic, paper and pulp, textile, distilleries and tanneries industries [1]. The objective of the present study was to investigate the optimum condition for maximum adsorption of Methylene Blue dye on cellulose dusts. The influences of the effective parameters including adsorbent dosage and contact time were optimized by CCD which stands for central composite design. The adsorption efficiency was estimated for the various runs performed using CCD. Following equation was used to obtain the percentage of the dye that has been removed. %???????=??−????×100 (1)igure 1 shows the effect of time and initial MB concentration on MB removal show that removal rate at beginning of the process is rapid because of high available surface area and vacant site of adsorbent, while their subsequent saturation is proportional with reduction in signal. Although the actual amount of MB at higher initial MB concentration, probably due to saturation of reactive sites or increasing the repulsive force between the adsorbed MB and bulk molecules lead to reduction in the percentage of removal.

Keywords:

Methylene Blue , Adsorption , Optimization , Central Composite design.